arch/x86/kernel/setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *
   4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   5  *
   6  *  Memory region support
   7  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
   8  *
   9  *  Added E820 sanitization routine (removes overlapping memory regions);
  10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  11  *
  12  * Moved CPU detection code to cpu/${cpu}.c
  13  *    Patrick Mochel <mochel@osdl.org>, March 2002
  14  *
  15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  16  *  Alex Achenbach <xela@slit.de>, December 2002.
  17  *
  18  */
  19
  20 /*
  21  * This file handles the architecture-dependent parts of initialization
  22  */
  23
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/ioport.h>
  29 #include <linux/acpi.h>
  30 #include <linux/sfi.h>
  31 #include <linux/apm_bios.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/memblock.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/console.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/highmem.h>
  39 #include <linux/module.h>
  40 #include <linux/efi.h>
  41 #include <linux/init.h>
  42 #include <linux/edd.h>
  43 #include <linux/iscsi_ibft.h>
  44 #include <linux/nodemask.h>
  45 #include <linux/kexec.h>
  46 #include <linux/dmi.h>
  47 #include <linux/pfn.h>
  48 #include <linux/pci.h>
  49 #include <asm/pci-direct.h>
  50 #include <linux/init_ohci1394_dma.h>
  51 #include <linux/kvm_para.h>
  52 #include <linux/dma-contiguous.h>
  53
  54 #include <linux/errno.h>
  55 #include <linux/kernel.h>
  56 #include <linux/stddef.h>
  57 #include <linux/unistd.h>
  58 #include <linux/ptrace.h>
  59 #include <linux/user.h>
  60 #include <linux/delay.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/cpufreq.h>
  64 #include <linux/dma-mapping.h>
  65 #include <linux/ctype.h>
  66 #include <linux/uaccess.h>
  67
  68 #include <linux/percpu.h>
  69 #include <linux/crash_dump.h>
  70 #include <linux/tboot.h>
  71 #include <linux/jiffies.h>
  72
  73 #include <video/edid.h>
  74
  75 #include <asm/mtrr.h>
  76 #include <asm/apic.h>
  77 #include <asm/realmode.h>
  78 #include <asm/e820.h>
  79 #include <asm/mpspec.h>
  80 #include <asm/setup.h>
  81 #include <asm/efi.h>
  82 #include <asm/timer.h>
  83 #include <asm/i8259.h>
  84 #include <asm/sections.h>
  85 #include <asm/dmi.h>
  86 #include <asm/io_apic.h>
  87 #include <asm/ist.h>
  88 #include <asm/setup_arch.h>
  89 #include <asm/bios_ebda.h>
  90 #include <asm/cacheflush.h>
  91 #include <asm/processor.h>
  92 #include <asm/bugs.h>
  93
  94 #include <asm/vsyscall.h>
  95 #include <asm/cpu.h>
  96 #include <asm/desc.h>
  97 #include <asm/dma.h>
  98 #include <asm/iommu.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <asm/paravirt.h>
 104 #include <asm/hypervisor.h>
 105 #include <asm/olpc_ofw.h>
 106
 107 #include <asm/percpu.h>
 108 #include <asm/topology.h>
 109 #include <asm/apicdef.h>
 110 #include <asm/amd_nb.h>
 111 #ifdef CONFIG_X86_64
 112 #include <asm/numa_64.h>
 113 #endif
 114 #include <asm/mce.h>
 115 #include <asm/alternative.h>
 116 #include <asm/prom.h>
 117
 118 /*
 119  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 120  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 121  * apertures, ACPI and other tables without having to play with fixmaps.
 122  */
 123 unsigned long max_low_pfn_mapped;
 124 unsigned long max_pfn_mapped;
 125
 126 #ifdef CONFIG_DMI
 127 RESERVE_BRK(dmi_alloc, 65536);
 128 #endif
 129
 130
 131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 132 unsigned long _brk_end = (unsigned long)__brk_base;
 133
 134 #ifdef CONFIG_X86_64
 135 int default_cpu_present_to_apicid(int mps_cpu)
 136 {
 137         return __default_cpu_present_to_apicid(mps_cpu);
 138 }
 139
 140 int default_check_phys_apicid_present(int phys_apicid)
 141 {
 142         return __default_check_phys_apicid_present(phys_apicid);
 143 }
 144 #endif
 145
 146 struct boot_params boot_params;
 147
 148 /*
 149  * Machine setup..
 150  */
 151 static struct resource data_resource = {
 152         .name   = "Kernel data",
 153         .start  = 0,
 154         .end    = 0,
 155         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 156 };
 157
 158 static struct resource code_resource = {
 159         .name   = "Kernel code",
 160         .start  = 0,
 161         .end    = 0,
 162         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 163 };
 164
 165 static struct resource bss_resource = {
 166         .name   = "Kernel bss",
 167         .start  = 0,
 168         .end    = 0,
 169         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 170 };
 171
 172
 173 #ifdef CONFIG_X86_32
 174 /* cpu data as detected by the assembly code in head.S */
 175 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 176 /* common cpu data for all cpus */
 177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 178 EXPORT_SYMBOL(boot_cpu_data);
 179
 180 unsigned int def_to_bigsmp;
 181
 182 /* for MCA, but anyone else can use it if they want */
 183 unsigned int machine_id;
 184 unsigned int machine_submodel_id;
 185 unsigned int BIOS_revision;
 186
 187 struct apm_info apm_info;
 188 EXPORT_SYMBOL(apm_info);
 189
 190 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 191         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 192 struct ist_info ist_info;
 193 EXPORT_SYMBOL(ist_info);
 194 #else
 195 struct ist_info ist_info;
 196 #endif
 197
 198 #else
 199 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 200         .x86_phys_bits = MAX_PHYSMEM_BITS,
 201 };
 202 EXPORT_SYMBOL(boot_cpu_data);
 203 #endif
 204
 205
 206 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 207 unsigned long mmu_cr4_features;
 208 #else
 209 unsigned long mmu_cr4_features = X86_CR4_PAE;
 210 #endif
 211
 212 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 213 int bootloader_type, bootloader_version;
 214
 215 /*
 216  * Setup options
 217  */
 218 struct screen_info screen_info;
 219 EXPORT_SYMBOL(screen_info);
 220 struct edid_info edid_info;
 221 EXPORT_SYMBOL_GPL(edid_info);
 222
 223 extern int root_mountflags;
 224
 225 unsigned long saved_video_mode;
 226
 227 #define RAMDISK_IMAGE_START_MASK        0x07FF
 228 #define RAMDISK_PROMPT_FLAG             0x8000
 229 #define RAMDISK_LOAD_FLAG               0x4000
 230
 231 static char __initdata command_line[COMMAND_LINE_SIZE];
 232 #ifdef CONFIG_CMDLINE_BOOL
 233 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 234 #endif
 235
 236 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 237 struct edd edd;
 238 #ifdef CONFIG_EDD_MODULE
 239 EXPORT_SYMBOL(edd);
 240 #endif
 241 /**
 242  * copy_edd() - Copy the BIOS EDD information
 243  *              from boot_params into a safe place.
 244  *
 245  */
 246 static inline void __init copy_edd(void)
 247 {
 248      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 249             sizeof(edd.mbr_signature));
 250      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 251      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 252      edd.edd_info_nr = boot_params.eddbuf_entries;
 253 }
 254 #else
 255 static inline void __init copy_edd(void)
 256 {
 257 }
 258 #endif
 259
 260 void * __init extend_brk(size_t size, size_t align)
 261 {
 262         size_t mask = align - 1;
 263         void *ret;
 264
 265         BUG_ON(_brk_start == 0);
 266         BUG_ON(align & mask);
 267
 268         _brk_end = (_brk_end + mask) & ~mask;
 269         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 270
 271         ret = (void *)_brk_end;
 272         _brk_end += size;
 273
 274         memset(ret, 0, size);
 275
 276         return ret;
 277 }
 278
 279 #ifdef CONFIG_X86_64
 280 static void __init init_gbpages(void)
 281 {
 282         if (direct_gbpages && cpu_has_gbpages)
 283                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 284         else
 285                 direct_gbpages = 0;
 286 }
 287 #else
 288 static inline void init_gbpages(void)
 289 {
 290 }
 291 static void __init cleanup_highmap(void)
 292 {
 293 }
 294 #endif
 295
 296 static void __init reserve_brk(void)
 297 {
 298         if (_brk_end > _brk_start)
 299                 memblock_reserve(__pa(_brk_start),
 300                                  __pa(_brk_end) - __pa(_brk_start));
 301
 302         /* Mark brk area as locked down and no longer taking any
 303            new allocations */
 304         _brk_start = 0;
 305 }
 306
 307 #ifdef CONFIG_BLK_DEV_INITRD
 308
 309 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 310 static void __init relocate_initrd(void)
 311 {
 312         /* Assume only end is not page aligned */
 313         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 314         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 315         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 316         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 317         u64 ramdisk_here;
 318         unsigned long slop, clen, mapaddr;
 319         char *p, *q;
 320
 321         /* We need to move the initrd down into lowmem */
 322         ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,
 323                                          PAGE_SIZE);
 324
 325         if (!ramdisk_here)
 326                 panic("Cannot find place for new RAMDISK of size %lld\n",
 327                          ramdisk_size);
 328
 329         /* Note: this includes all the lowmem currently occupied by
 330            the initrd, we rely on that fact to keep the data intact. */
 331         memblock_reserve(ramdisk_here, area_size);
 332         initrd_start = ramdisk_here + PAGE_OFFSET;
 333         initrd_end   = initrd_start + ramdisk_size;
 334         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 335                          ramdisk_here, ramdisk_here + ramdisk_size - 1);
 336
 337         q = (char *)initrd_start;
 338
 339         /* Copy any lowmem portion of the initrd */
 340         if (ramdisk_image < end_of_lowmem) {
 341                 clen = end_of_lowmem - ramdisk_image;
 342                 p = (char *)__va(ramdisk_image);
 343                 memcpy(q, p, clen);
 344                 q += clen;
 345                 ramdisk_image += clen;
 346                 ramdisk_size  -= clen;
 347         }
 348
 349         /* Copy the highmem portion of the initrd */
 350         while (ramdisk_size) {
 351                 slop = ramdisk_image & ~PAGE_MASK;
 352                 clen = ramdisk_size;
 353                 if (clen > MAX_MAP_CHUNK-slop)
 354                         clen = MAX_MAP_CHUNK-slop;
 355                 mapaddr = ramdisk_image & PAGE_MASK;
 356                 p = early_memremap(mapaddr, clen+slop);
 357                 memcpy(q, p+slop, clen);
 358                 early_iounmap(p, clen+slop);
 359                 q += clen;
 360                 ramdisk_image += clen;
 361                 ramdisk_size  -= clen;
 362         }
 363         /* high pages is not converted by early_res_to_bootmem */
 364         ramdisk_image = boot_params.hdr.ramdisk_image;
 365         ramdisk_size  = boot_params.hdr.ramdisk_size;
 366         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 367                 " [mem %#010llx-%#010llx]\n",
 368                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 369                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 370 }
 371
 372 static void __init reserve_initrd(void)
 373 {
 374         /* Assume only end is not page aligned */
 375         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 376         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 377         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 378         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 379
 380         if (!boot_params.hdr.type_of_loader ||
 381             !ramdisk_image || !ramdisk_size)
 382                 return;         /* No initrd provided by bootloader */
 383
 384         initrd_start = 0;
 385
 386         if (ramdisk_size >= (end_of_lowmem>>1)) {
 387                 panic("initrd too large to handle, "
 388                        "disabling initrd (%lld needed, %lld available)\n",
 389                        ramdisk_size, end_of_lowmem>>1);
 390         }
 391
 392         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 393                         ramdisk_end - 1);
 394
 395
 396         if (ramdisk_end <= end_of_lowmem) {
 397                 /* All in lowmem, easy case */
 398                 /*
 399                  * don't need to reserve again, already reserved early
 400                  * in i386_start_kernel
 401                  */
 402                 initrd_start = ramdisk_image + PAGE_OFFSET;
 403                 initrd_end = initrd_start + ramdisk_size;
 404                 return;
 405         }
 406
 407         relocate_initrd();
 408
 409         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 410 }
 411 #else
 412 static void __init reserve_initrd(void)
 413 {
 414 }
 415 #endif /* CONFIG_BLK_DEV_INITRD */
 416
 417 static void __init parse_setup_data(void)
 418 {
 419         struct setup_data *data;
 420         u64 pa_data;
 421
 422         if (boot_params.hdr.version < 0x0209)
 423                 return;
 424         pa_data = boot_params.hdr.setup_data;
 425         while (pa_data) {
 426                 u32 data_len, map_len;
 427
 428                 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
 429                               (u64)sizeof(struct setup_data));
 430                 data = early_memremap(pa_data, map_len);
 431                 data_len = data->len + sizeof(struct setup_data);
 432                 if (data_len > map_len) {
 433                         early_iounmap(data, map_len);
 434                         data = early_memremap(pa_data, data_len);
 435                         map_len = data_len;
 436                 }
 437
 438                 switch (data->type) {
 439                 case SETUP_E820_EXT:
 440                         parse_e820_ext(data);
 441                         break;
 442                 case SETUP_DTB:
 443                         add_dtb(pa_data);
 444                         break;
 445                 default:
 446                         break;
 447                 }
 448                 pa_data = data->next;
 449                 early_iounmap(data, map_len);
 450         }
 451 }
 452
 453 static void __init e820_reserve_setup_data(void)
 454 {
 455         struct setup_data *data;
 456         u64 pa_data;
 457         int found = 0;
 458
 459         if (boot_params.hdr.version < 0x0209)
 460                 return;
 461         pa_data = boot_params.hdr.setup_data;
 462         while (pa_data) {
 463                 data = early_memremap(pa_data, sizeof(*data));
 464                 e820_update_range(pa_data, sizeof(*data)+data->len,
 465                          E820_RAM, E820_RESERVED_KERN);
 466                 found = 1;
 467                 pa_data = data->next;
 468                 early_iounmap(data, sizeof(*data));
 469         }
 470         if (!found)
 471                 return;
 472
 473         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 474         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 475         printk(KERN_INFO "extended physical RAM map:\n");
 476         e820_print_map("reserve setup_data");
 477 }
 478
 479 static void __init memblock_x86_reserve_range_setup_data(void)
 480 {
 481         struct setup_data *data;
 482         u64 pa_data;
 483
 484         if (boot_params.hdr.version < 0x0209)
 485                 return;
 486         pa_data = boot_params.hdr.setup_data;
 487         while (pa_data) {
 488                 data = early_memremap(pa_data, sizeof(*data));
 489                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 490                 pa_data = data->next;
 491                 early_iounmap(data, sizeof(*data));
 492         }
 493 }
 494
 495 /*
 496  * --------- Crashkernel reservation ------------------------------
 497  */
 498
 499 #ifdef CONFIG_KEXEC
 500
 501 /*
 502  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 503  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 504  * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
 505  * limit once kexec-tools are fixed.
 506  */
 507 #ifdef CONFIG_X86_32
 508 # define CRASH_KERNEL_ADDR_MAX  (512 << 20)
 509 #else
 510 # define CRASH_KERNEL_ADDR_MAX  (896 << 20)
 511 #endif
 512
 513 static void __init reserve_crashkernel(void)
 514 {
 515         unsigned long long total_mem;
 516         unsigned long long crash_size, crash_base;
 517         int ret;
 518
 519         total_mem = memblock_phys_mem_size();
 520
 521         ret = parse_crashkernel(boot_command_line, total_mem,
 522                         &crash_size, &crash_base);
 523         if (ret != 0 || crash_size <= 0)
 524                 return;
 525
 526         /* 0 means: find the address automatically */
 527         if (crash_base <= 0) {
 528                 const unsigned long long alignment = 16<<20;    /* 16M */
 529
 530                 /*
 531                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
 532                  */
 533                 crash_base = memblock_find_in_range(alignment,
 534                                CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
 535
 536                 if (!crash_base) {
 537                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 538                         return;
 539                 }
 540         } else {
 541                 unsigned long long start;
 542
 543                 start = memblock_find_in_range(crash_base,
 544                                  crash_base + crash_size, crash_size, 1<<20);
 545                 if (start != crash_base) {
 546                         pr_info("crashkernel reservation failed - memory is in use.\n");
 547                         return;
 548                 }
 549         }
 550         memblock_reserve(crash_base, crash_size);
 551
 552         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 553                         "for crashkernel (System RAM: %ldMB)\n",
 554                         (unsigned long)(crash_size >> 20),
 555                         (unsigned long)(crash_base >> 20),
 556                         (unsigned long)(total_mem >> 20));
 557
 558         crashk_res.start = crash_base;
 559         crashk_res.end   = crash_base + crash_size - 1;
 560         insert_resource(&iomem_resource, &crashk_res);
 561 }
 562 #else
 563 static void __init reserve_crashkernel(void)
 564 {
 565 }
 566 #endif
 567
 568 static struct resource standard_io_resources[] = {
 569         { .name = "dma1", .start = 0x00, .end = 0x1f,
 570                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 571         { .name = "pic1", .start = 0x20, .end = 0x21,
 572                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 573         { .name = "timer0", .start = 0x40, .end = 0x43,
 574                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 575         { .name = "timer1", .start = 0x50, .end = 0x53,
 576                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 577         { .name = "keyboard", .start = 0x60, .end = 0x60,
 578                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 579         { .name = "keyboard", .start = 0x64, .end = 0x64,
 580                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 581         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 582                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 583         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 584                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 585         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 586                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 587         { .name = "fpu", .start = 0xf0, .end = 0xff,
 588                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 589 };
 590
 591 void __init reserve_standard_io_resources(void)
 592 {
 593         int i;
 594
 595         /* request I/O space for devices used on all i[345]86 PCs */
 596         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 597                 request_resource(&ioport_resource, &standard_io_resources[i]);
 598
 599 }
 600
 601 static __init void reserve_ibft_region(void)
 602 {
 603         unsigned long addr, size = 0;
 604
 605         addr = find_ibft_region(&size);
 606
 607         if (size)
 608                 memblock_reserve(addr, size);
 609 }
 610
 611 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 612
 613 static bool __init snb_gfx_workaround_needed(void)
 614 {
 615 #ifdef CONFIG_PCI
 616         int i;
 617         u16 vendor, devid;
 618         static const __initconst u16 snb_ids[] = {
 619                 0x0102,
 620                 0x0112,
 621                 0x0122,
 622                 0x0106,
 623                 0x0116,
 624                 0x0126,
 625                 0x010a,
 626         };
 627
 628         /* Assume no if something weird is going on with PCI */
 629         if (!early_pci_allowed())
 630                 return false;
 631
 632         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 633         if (vendor != 0x8086)
 634                 return false;
 635
 636         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 637         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 638                 if (devid == snb_ids[i])
 639                         return true;
 640 #endif
 641
 642         return false;
 643 }
 644
 645 /*
 646  * Sandy Bridge graphics has trouble with certain ranges, exclude
 647  * them from allocation.
 648  */
 649 static void __init trim_snb_memory(void)
 650 {
 651         static const __initconst unsigned long bad_pages[] = {
 652                 0x20050000,
 653                 0x20110000,
 654                 0x20130000,
 655                 0x20138000,
 656                 0x40004000,
 657         };
 658         int i;
 659
 660         if (!snb_gfx_workaround_needed())
 661                 return;
 662
 663         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 664
 665         /*
 666          * Reserve all memory below the 1 MB mark that has not
 667          * already been reserved.
 668          */
 669         memblock_reserve(0, 1<<20);
 670
 671         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 672                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 673                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 674                                bad_pages[i]);
 675         }
 676 }
 677
 678 /*
 679  * Here we put platform-specific memory range workarounds, i.e.
 680  * memory known to be corrupt or otherwise in need to be reserved on
 681  * specific platforms.
 682  *
 683  * If this gets used more widely it could use a real dispatch mechanism.
 684  */
 685 static void __init trim_platform_memory_ranges(void)
 686 {
 687         trim_snb_memory();
 688 }
 689
 690 static void __init trim_bios_range(void)
 691 {
 692         /*
 693          * A special case is the first 4Kb of memory;
 694          * This is a BIOS owned area, not kernel ram, but generally
 695          * not listed as such in the E820 table.
 696          *
 697          * This typically reserves additional memory (64KiB by default)
 698          * since some BIOSes are known to corrupt low memory.  See the
 699          * Kconfig help text for X86_RESERVE_LOW.
 700          */
 701         e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
 702                           E820_RAM, E820_RESERVED);
 703
 704         /*
 705          * special case: Some BIOSen report the PC BIOS
 706          * area (640->1Mb) as ram even though it is not.
 707          * take them out.
 708          */
 709         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
 710
 711         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 712 }
 713
 714 static int __init parse_reservelow(char *p)
 715 {
 716         unsigned long long size;
 717
 718         if (!p)
 719                 return -EINVAL;
 720
 721         size = memparse(p, &p);
 722
 723         if (size < 4096)
 724                 size = 4096;
 725
 726         if (size > 640*1024)
 727                 size = 640*1024;
 728
 729         reserve_low = size;
 730
 731         return 0;
 732 }
 733
 734 early_param("reservelow", parse_reservelow);
 735
 736 /*
 737  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 738  * passed the efi memmap, systab, etc., so we should use these data structures
 739  * for initialization.  Note, the efi init code path is determined by the
 740  * global efi_enabled. This allows the same kernel image to be used on existing
 741  * systems (with a traditional BIOS) as well as on EFI systems.
 742  */
 743 /*
 744  * setup_arch - architecture-specific boot-time initializations
 745  *
 746  * Note: On x86_64, fixmaps are ready for use even before this is called.
 747  */
 748
 749 void __init setup_arch(char **cmdline_p)
 750 {
 751 #ifdef CONFIG_X86_32
 752         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 753         visws_early_detect();
 754
 755         /*
 756          * copy kernel address range established so far and switch
 757          * to the proper swapper page table
 758          */
 759         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 760                         initial_page_table + KERNEL_PGD_BOUNDARY,
 761                         KERNEL_PGD_PTRS);
 762
 763         load_cr3(swapper_pg_dir);
 764         __flush_tlb_all();
 765 #else
 766         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 767 #endif
 768
 769         /*
 770          * If we have OLPC OFW, we might end up relocating the fixmap due to
 771          * reserve_top(), so do this before touching the ioremap area.
 772          */
 773         olpc_ofw_detect();
 774
 775         early_trap_init();
 776         early_cpu_init();
 777         early_ioremap_init();
 778
 779         setup_olpc_ofw_pgd();
 780
 781         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 782         screen_info = boot_params.screen_info;
 783         edid_info = boot_params.edid_info;
 784 #ifdef CONFIG_X86_32
 785         apm_info.bios = boot_params.apm_bios_info;
 786         ist_info = boot_params.ist_info;
 787         if (boot_params.sys_desc_table.length != 0) {
 788                 machine_id = boot_params.sys_desc_table.table[0];
 789                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 790                 BIOS_revision = boot_params.sys_desc_table.table[2];
 791         }
 792 #endif
 793         saved_video_mode = boot_params.hdr.vid_mode;
 794         bootloader_type = boot_params.hdr.type_of_loader;
 795         if ((bootloader_type >> 4) == 0xe) {
 796                 bootloader_type &= 0xf;
 797                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 798         }
 799         bootloader_version  = bootloader_type & 0xf;
 800         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 801
 802 #ifdef CONFIG_BLK_DEV_RAM
 803         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 804         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 805         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 806 #endif
 807 #ifdef CONFIG_EFI
 808         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 809                      "EL32", 4)) {
 810                 set_bit(EFI_BOOT, &x86_efi_facility);
 811         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 812                      "EL64", 4)) {
 813                 set_bit(EFI_BOOT, &x86_efi_facility);
 814                 set_bit(EFI_64BIT, &x86_efi_facility);
 815         }
 816
 817         if (efi_enabled(EFI_BOOT))
 818                 efi_memblock_x86_reserve_range();
 819 #endif
 820
 821         x86_init.oem.arch_setup();
 822
 823         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 824         setup_memory_map();
 825         parse_setup_data();
 826         /* update the e820_saved too */
 827         e820_reserve_setup_data();
 828
 829         copy_edd();
 830
 831         if (!boot_params.hdr.root_flags)
 832                 root_mountflags &= ~MS_RDONLY;
 833         init_mm.start_code = (unsigned long) _text;
 834         init_mm.end_code = (unsigned long) _etext;
 835         init_mm.end_data = (unsigned long) _edata;
 836         init_mm.brk = _brk_end;
 837
 838         code_resource.start = virt_to_phys(_text);
 839         code_resource.end = virt_to_phys(_etext)-1;
 840         data_resource.start = virt_to_phys(_etext);
 841         data_resource.end = virt_to_phys(_edata)-1;
 842         bss_resource.start = virt_to_phys(&__bss_start);
 843         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 844
 845 #ifdef CONFIG_CMDLINE_BOOL
 846 #ifdef CONFIG_CMDLINE_OVERRIDE
 847         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 848 #else
 849         if (builtin_cmdline[0]) {
 850                 /* append boot loader cmdline to builtin */
 851                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 852                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 853                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 854         }
 855 #endif
 856 #endif
 857
 858         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 859         *cmdline_p = command_line;
 860
 861         /*
 862          * x86_configure_nx() is called before parse_early_param() to detect
 863          * whether hardware doesn't support NX (so that the early EHCI debug
 864          * console setup can safely call set_fixmap()). It may then be called
 865          * again from within noexec_setup() during parsing early parameters
 866          * to honor the respective command line option.
 867          */
 868         x86_configure_nx();
 869
 870         parse_early_param();
 871
 872         x86_report_nx();
 873
 874         /* after early param, so could get panic from serial */
 875         memblock_x86_reserve_range_setup_data();
 876
 877         if (acpi_mps_check()) {
 878 #ifdef CONFIG_X86_LOCAL_APIC
 879                 disable_apic = 1;
 880 #endif
 881                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 882         }
 883
 884 #ifdef CONFIG_PCI
 885         if (pci_early_dump_regs)
 886                 early_dump_pci_devices();
 887 #endif
 888
 889         finish_e820_parsing();
 890
 891         if (efi_enabled(EFI_BOOT))
 892                 efi_init();
 893
 894         dmi_scan_machine();
 895
 896         /*
 897          * VMware detection requires dmi to be available, so this
 898          * needs to be done after dmi_scan_machine, for the BP.
 899          */
 900         init_hypervisor_platform();
 901
 902         x86_init.resources.probe_roms();
 903
 904         /* after parse_early_param, so could debug it */
 905         insert_resource(&iomem_resource, &code_resource);
 906         insert_resource(&iomem_resource, &data_resource);
 907         insert_resource(&iomem_resource, &bss_resource);
 908
 909         trim_bios_range();
 910 #ifdef CONFIG_X86_32
 911         if (ppro_with_ram_bug()) {
 912                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 913                                   E820_RESERVED);
 914                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 915                 printk(KERN_INFO "fixed physical RAM map:\n");
 916                 e820_print_map("bad_ppro");
 917         }
 918 #else
 919         early_gart_iommu_check();
 920 #endif
 921
 922         /*
 923          * partially used pages are not usable - thus
 924          * we are rounding upwards:
 925          */
 926         max_pfn = e820_end_of_ram_pfn();
 927
 928         /* update e820 for memory not covered by WB MTRRs */
 929         mtrr_bp_init();
 930         if (mtrr_trim_uncached_memory(max_pfn))
 931                 max_pfn = e820_end_of_ram_pfn();
 932
 933 #ifdef CONFIG_X86_32
 934         /* max_low_pfn get updated here */
 935         find_low_pfn_range();
 936 #else
 937         num_physpages = max_pfn;
 938
 939         check_x2apic();
 940
 941         /* How many end-of-memory variables you have, grandma! */
 942         /* need this before calling reserve_initrd */
 943         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 944                 max_low_pfn = e820_end_of_low_ram_pfn();
 945         else
 946                 max_low_pfn = max_pfn;
 947
 948         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 949 #endif
 950
 951         /*
 952          * Find and reserve possible boot-time SMP configuration:
 953          */
 954         find_smp_config();
 955
 956         reserve_ibft_region();
 957
 958         /*
 959          * Need to conclude brk, before memblock_x86_fill()
 960          *  it could use memblock_find_in_range, could overlap with
 961          *  brk area.
 962          */
 963         reserve_brk();
 964
 965         cleanup_highmap();
 966
 967         memblock.current_limit = get_max_mapped();
 968         memblock_x86_fill();
 969
 970         /*
 971          * The EFI specification says that boot service code won't be called
 972          * after ExitBootServices(). This is, in fact, a lie.
 973          */
 974         if (efi_enabled(EFI_MEMMAP))
 975                 efi_reserve_boot_services();
 976
 977         /* preallocate 4k for mptable mpc */
 978         early_reserve_e820_mpc_new();
 979
 980 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 981         setup_bios_corruption_check();
 982 #endif
 983
 984         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
 985                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
 986
 987         setup_real_mode();
 988
 989         trim_platform_memory_ranges();
 990
 991         init_gbpages();
 992
 993         /* max_pfn_mapped is updated here */
 994         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 995         max_pfn_mapped = max_low_pfn_mapped;
 996
 997 #ifdef CONFIG_X86_64
 998         if (max_pfn > max_low_pfn) {
 999                 int i;
1000                 unsigned long start, end;
1001                 unsigned long start_pfn, end_pfn;
1002
1003                 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
1004                                                          NULL) {
1005
1006                         end = PFN_PHYS(end_pfn);
1007                         if (end <= (1UL<<32))
1008                                 continue;
1009
1010                         start = PFN_PHYS(start_pfn);
1011                         max_pfn_mapped = init_memory_mapping(
1012                                                 max((1UL<<32), start), end);
1013                 }
1014
1015                 /* can we preseve max_low_pfn ?*/
1016                 max_low_pfn = max_pfn;
1017         }
1018 #endif
1019         memblock.current_limit = get_max_mapped();
1020         dma_contiguous_reserve(0);
1021
1022         /*
1023          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1024          */
1025
1026 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1027         if (init_ohci1394_dma_early)
1028                 init_ohci1394_dma_on_all_controllers();
1029 #endif
1030         /* Allocate bigger log buffer */
1031         setup_log_buf(1);
1032
1033         reserve_initrd();
1034
1035 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1036         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1037 #endif
1038
1039         reserve_crashkernel();
1040
1041         vsmp_init();
1042
1043         io_delay_init();
1044
1045         /*
1046          * Parse the ACPI tables for possible boot-time SMP configuration.
1047          */
1048         acpi_boot_table_init();
1049
1050         early_acpi_boot_init();
1051
1052         initmem_init();
1053         memblock_find_dma_reserve();
1054
1055 #ifdef CONFIG_KVM_GUEST
1056         kvmclock_init();
1057 #endif
1058
1059         x86_init.paging.pagetable_init();
1060
1061         if (boot_cpu_data.cpuid_level >= 0) {
1062                 /* A CPU has %cr4 if and only if it has CPUID */
1063                 mmu_cr4_features = read_cr4();
1064                 if (trampoline_cr4_features)
1065                         *trampoline_cr4_features = mmu_cr4_features;
1066         }
1067
1068 #ifdef CONFIG_X86_32
1069         /* sync back kernel address range */
1070         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1071                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1072                         KERNEL_PGD_PTRS);
1073 #endif
1074
1075         tboot_probe();
1076
1077 #ifdef CONFIG_X86_64
1078         map_vsyscall();
1079 #endif
1080
1081         generic_apic_probe();
1082
1083         early_quirks();
1084
1085         /*
1086          * Read APIC and some other early information from ACPI tables.
1087          */
1088         acpi_boot_init();
1089         sfi_init();
1090         x86_dtb_init();
1091
1092         /*
1093          * get boot-time SMP configuration:
1094          */
1095         if (smp_found_config)
1096                 get_smp_config();
1097
1098         prefill_possible_map();
1099
1100         init_cpu_to_node();
1101
1102         init_apic_mappings();
1103         if (x86_io_apic_ops.init)
1104                 x86_io_apic_ops.init();
1105
1106         kvm_guest_init();
1107
1108         e820_reserve_resources();
1109         e820_mark_nosave_regions(max_low_pfn);
1110
1111         x86_init.resources.reserve_resources();
1112
1113         e820_setup_gap();
1114
1115 #ifdef CONFIG_VT
1116 #if defined(CONFIG_VGA_CONSOLE)
1117         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1118                 conswitchp = &vga_con;
1119 #elif defined(CONFIG_DUMMY_CONSOLE)
1120         conswitchp = &dummy_con;
1121 #endif
1122 #endif
1123         x86_init.oem.banner();
1124
1125         x86_init.timers.wallclock_init();
1126
1127         mcheck_init();
1128
1129         arch_init_ideal_nops();
1130
1131         register_refined_jiffies(CLOCK_TICK_RATE);
1132
1133 #ifdef CONFIG_EFI
1134         /* Once setup is done above, unmap the EFI memory map on
1135          * mismatched firmware/kernel archtectures since there is no
1136          * support for runtime services.
1137          */
1138         if (efi_enabled(EFI_BOOT) &&
1139             IS_ENABLED(CONFIG_X86_64) != efi_enabled(EFI_64BIT)) {
1140                 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1141                 efi_unmap_memmap();
1142         }
1143 #endif
1144 }
1145
1146 #ifdef CONFIG_X86_32
1147
1148 static struct resource video_ram_resource = {
1149         .name   = "Video RAM area",
1150         .start  = 0xa0000,
1151         .end    = 0xbffff,
1152         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1153 };
1154
1155 void __init i386_reserve_resources(void)
1156 {
1157         request_resource(&iomem_resource, &video_ram_resource);
1158         reserve_standard_io_resources();
1159 }
1160
1161 #endif /* CONFIG_X86_32 */